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<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Html元素分类</title>
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<body>
  <div>我的块级元素</div>
  <p><span>内联元素</span> <em>内联元素</em> <strong>好巧，我也是内联元素</strong></p>
  <p><select><option>下拉框</option></select> <span>你猜左边是什么元素</span></p>
</body>
</html>
